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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d4e8a551749cd9160b0e5116fa4312578526c17ec382e34b3945c3ac0d842d' 
  AND token = 'oAVAUWxrxAywihGBzjF9NrR4RUwK40EhdLq0C4yVJ54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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