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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ebdb564eab02b566f95dc3821a2e93d3815098d22a502c2b2067d8d2faafef' 
  AND token = 'WsIxHVzroMNze58ZHWS2KrjQB8HYtWUlGBagHUlPIKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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