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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531d31fead75df507db2dd337bc4b10121208096eda51d91a284733454048fdf' 
  AND token = 'f4meZd1KjCfjh8Dr/B+XA8Ae97Vpb8IMxtXaE5qW844=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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