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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16ee64b79fc6333215bf95a490fb5af40987746be4272502d4c533f4c677d59' 
  AND token = '8xYm7xPz07hIw/PlPnXkEreEBqmM4dSx/t9DVV9VvMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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