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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3627b0bab897e5943a57e55caa17756f8f907176405973c483153ef0c12d9e40' 
  AND token = '1c+D+UxdY7/rrAkoWty3Og+f+6177DdiEqVWQ2o9vls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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