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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d37e7783f7aa1159db7db688cd1d77803b8904de9c4b0490c506a7f0c78788' 
  AND token = 'n2+ewYUpEu+reamn0zKFW0NeP3oetv5HoX1LNaPbpbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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