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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf467df91a04268a93e63908b4eb108f58155d1f7eea52beb2b53733e72772ed' 
  AND token = 'rhNJ1jp0Nd0ajp/i+F4jL5uLcdbbOgDE++m4TNc0aAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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