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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e058b0303644c9c90cd7e0c5a595d51ed2087bd4fa61f6210e77f16b6c5c403' 
  AND token = 'SOGhpq8J8YmSJA/4sIawq7pc9I7VzAmvXGyUA0hXr7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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