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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36b1953e31a54a01e12ecaf7c675b36d6ad9571fc1f5c27f6c4b2dc65253a58' 
  AND token = 'xOYHA1L/XU6+ayHOJ1OZcEUveDJ0nR0Q6L1W4u9ffBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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