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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e8c786e656987de46dc0316005ee6c94418214c8e786d85169273d32a3f8cb' 
  AND token = 'KUeUI41zI8ukdrzARIEaDwk//ml9EL5lfSQkk85GwVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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