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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a2f56f07cf8c85adc664a0501658aff64a52ca969423e225177c4a8b47e2d5' 
  AND token = '27mhoVWB5nQmFIt9d72W3eVV5LHQ26BdZdKwkA29jRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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