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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492afb34fd9b8b450d0cec7e4bc1dff3572fc6237a6d181906e454ba58d457a4' 
  AND token = 'pq9K0oMioGlY1YeGUscpVeBiRyHifbwrKb+W/dkM9B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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