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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d6788a99bfc65b317e4868a7c19a1258224262d96efe2cc2cc0fc03af67336' 
  AND token = 'pW7vRO44EMih3xkyfz6kks0R9vYcDP5ktffEl1xdmXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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