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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6babd4bd33cdfc2d64cf3382b365de231f3d8869ff048a22fae8808ca834f79' 
  AND token = '4PRhl+8K/e96smMOGdskE5I6c34QvDFn6vJC7BQT4bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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