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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ddd550503845cbc758ea3696b67ad3281236236a306e8b5cda82be91779541' 
  AND token = 'uHVady4uRs3yPvIirghcZ9R9GorlO1mpg6BIYwEUs9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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