SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe458de66b256006f7ef738cc3593bdc6d55b3f4d87d4639c55d4790646e91f1' 
  AND token = 'S3mmm2u4Rj2bPKG3PBb2BBh/jw9k4nDligYa/Hpqlzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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