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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec7b3e58db350e99d2b9d0b7c4e43dc96a3c46eadbb677e4fd3a9844ad5efae' 
  AND token = '365E0sHTlPwmOGQiYO/Iu8eTmaPsIH595yZ6fRcpIio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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