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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b357ea63a2da105227764066daadf9181ca9d9a235cad97b16d966bfb593794' 
  AND token = 'RurfOI7nZyA9WO8fMUuhQae8CLNdFolQJUD/cbuJPeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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