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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e76cc5abb4c40c8dff73e3ee7f4c585a9b6e9801fb4e11146d5110dcef4d85' 
  AND token = 'h5siMAmwvg+7hooF4lDX/JMeD0LPbaajkAa6dNciY6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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