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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83dce704a0816c26dd33ec6156c035436ca4e86abc1caf778cfbf1c55818bd7' 
  AND token = 'mmq2Hp2FHCBVcbrvb5nEDlR55PzJD6Z5lcFw5SHf41Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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