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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0335a71c8d22641058328171d9584ff1150b5e7af744de48d748c9e618ce2da5' 
  AND token = 'IJCH67LWsXm/3Y68DWhMZSmAGq16CCxmkWn2vUuCwHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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