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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c2dae870ad8f2e283a9de9c8334c01530c5767c7b5ae06964c198daf1c5a4d' 
  AND token = 'FfMzyKoZooZerS1LIbVys6tpmYT0h1kIWCXaLsv2+RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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