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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5671de2216dce5440502b4f56c415f3272c01f06cee0976a38d4846f9011cd1e' 
  AND token = '1Vc73Vmko01DtTr18jx69wzDX8SNjbbWiXQdagyuPjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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