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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796dc693218a259e7256c298a2fa51f42b1ffdf6fd3b03b74d0eaafea9e401cd' 
  AND token = 'vF6W+TLBjd4RxI/EJnDDJQ54SXoaRdNNhwZ8JJlstRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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