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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd482c9c4dc24b895756fdb7744223118e32c9f3383b685b1fe75db2af8ff39be' 
  AND token = 'EwPjDP9a21OLE4EYWp58Jlh2s4W/kdWASJDljpNh5uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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