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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183440343fe7fe4eb054fe3a548032507529f2261cdf0ea107e40c31cf4d8811' 
  AND token = 'OiCTviWI4QT5EB8KY+dmaR7UH773DYtnojdNTD8ENSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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