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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf880897492cc3dd58e307fb1ccb0e3c338d38aeaf275505d42fc8310a236086' 
  AND token = 'OpQtV0yh5VEcHrLQUjFIE8FILZr3Nr17HHxa2S+8LAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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