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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a198d937df2a4710aae34c0ae7b2d68f1c4d5f9ae1bd1691a6084bfadce7f11' 
  AND token = '87IRoBX/G0TD90SvE8JUqZ1v+z5TLqqEYoneldJ+f/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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