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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396ffb03886c18f99dcb46aa200f4758748b4fd40a080df38afa37a14be1c64e' 
  AND token = '41NMLSM+a+adj8ZqhACd0Ziy7Pf+L/qlXeSDNfs3kz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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