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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d8c5c299449378d838f19424f2e9f78404c427301ec22605b61e982b590992' 
  AND token = '/10I5ZWUMT9nvlyn5QNRpHtTpPnDT/q7C4no8fZ2qzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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