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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b39e1e24f8bba344db7fa7775893d3dbc7e11bc68fd9c0fc688dd77f84cb31' 
  AND token = 'wX1/45oNKDN7lHJQXavkiOGah5COCNcKv5SPu1DR5Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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