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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f83867838e3bf718e02c0dca446b504ff1ade33cc5e2f8fedd808b3d4e71fcc' 
  AND token = '6YJYyPRqVww0Mtcczcji2mJyQel/XubLaNXr2uR2mzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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