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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceeb34b952ddb311c6354cb014760b8398c8a8bd5d8a42743bfc67cf4d3c7eab' 
  AND token = 'Cq7eAj0F8y4Lkf33Msvt3fpW5/40SzMMy8pJ01VZgbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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