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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c70090ae8dded9085d4a186d1e975b0c066a052267d4715076c8de63c9af97' 
  AND token = 'iqrMjYCNpL62jZbRfN3V0hcRw4rozY3eWRJQRsE2nmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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