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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a7179ead2a83928819f99057e1aa24b5b00ae8a08b4bf08446e624ec922b37' 
  AND token = 'G7s83NN+2CdNpZ3qH9Mr4Zn7W4tcEY2b1yFDuV5G01c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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