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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8087be438656dc192f6a2c4e8a70c1459116c108ec13e7bab2aa814fb1793301' 
  AND token = 'HSB30I34EH8WV0w3EPpIAf+T/QGopFzeS0ulJfoBghk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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