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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe82c0f4d637c5dab3ada1378cfa8981e70ac894fe51ee823ad22e4ae6bde49' 
  AND token = 'xfhI11PL8ftWPadBs+MOX6NUgFz9+2syvD9POHN2BbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00274

JSON explain

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