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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd197c888e0146d86cd93e3848386fd2853b4a719c3e82b3b882e99700c252b' 
  AND token = 'hcFZl1ap9dxrJpcw91NHJaI0WHX2Hahv2V5k0VWxspc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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