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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c6cab90aa6ecdc847f1080883fe8186aa716e88e7a12e83eabf4e1f00d8e5a' 
  AND token = 'syM1bd/acYMCKgUYaqsZN6Iu5H0s6e4aEz56kqpGyYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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