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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a5d71df3780abe7a439af9ef76f0261160d27d1d17441d5da3fc06ea1179cb' 
  AND token = '14CmtBfOx6SORCAK1DKymeWXPg0FSTMNSzpCKtIEeP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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