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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbd7c222eef98cb4c7c43e8c108383f619024b38fa1fe02b7cde456513c7305' 
  AND token = 'Y9RDCEE4rkhjCm7DIxDfr4gmC+T3Vk4szhVOzZ3lZ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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