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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feca11ca73e6c5a358d1dc135c04aece3cfe3382c9eb7d8890b28d12267e089a' 
  AND token = '/W7afuM3RYtW29sZ11sYf2h+1OWTFbLcdTdDp17t1c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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