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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b7f2685bb877ce53a60d9ba540661cb7f3e5f8348e8cf4312d5c05bcfa567e' 
  AND token = 'DR2My8149612WrSGHX2VmFLCGkMC357m5KeRfBDtATE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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