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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c5bfa905b87bb459ab166f2c3ef67fff7b18aa4ab8c727ca53653d71cc66a3' 
  AND token = '/8qJd407H6yXU9z7Jyp1q44JN4wi8ilGJKeu8QtwUyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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