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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd871ca3edbfe8d8c5174abb33dfc92c92716e51d7ce5dec6a6d982e1d19398cb' 
  AND token = '9mkMNoEFfNz6SwOW/dRjjJENkX9q5XB7HC++avgWQXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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