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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c49df6657a9e332893b9b14fd7cbd8ce79f7a41ead6f73317fe68b19ebcc04' 
  AND token = 'NzXiaZuYyY4w4jModQ6Wfj99yrE+OFoOfVILdTNBXmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}