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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d75930ae4f1b3696cdeb4240b380d781c5dd6683f126229b96c6ac44a002b0' 
  AND token = 'mp2R68ovNMruAWvKo9c9WNfreu7rfHQOQ+NoIngq5L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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