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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b36bb9e861c3ed190955fb68462b90d54c11098750276323ab35233f2446be' 
  AND token = 'zn6wBWu5tmrqMs5pEORuOqpvppSUXiylTK/olUdC8lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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