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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43de5372e39ff655eae29b5adaf0dd6cae030efb676b93e9e9a8dd1ac746daf' 
  AND token = 'UwUp12zd+WDmC48pRftMoC5Cw7dgkrEX8/iWNnEKR9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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