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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8820dcfb1c0521e29c4b760d9385565674ac38af7fcda27f9ed5131e2e024d' 
  AND token = 'm4R45oFIHUpFSSJjiQvWL1yX15P33ZqNyWCEX6Le97I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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