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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b756bf37c4a55958b9112f78a780feb995a6a013168791a333d9934729b5ffe' 
  AND token = 'D2f1NjX0m7grDPcy1rhmzI+r8++15JoJY9fu52fnXrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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