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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ec9cd8d307f2318739e171fc4cc5ced436f727930fc4beb29b44c85b366cf7' 
  AND token = '9zMom5FnGy8NwrVk5YppcZMZxpg7V6rHqf66rt/1ik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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