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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1476fc73b42b4941bfc9da6aecb4b3825ebc9c22975a0eab2ea17ec0dcd37ed9' 
  AND token = 'i/6kmAyWKhlfPFCp8qYksba4UNdNgrdGF/1d4WYc3l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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