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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3f4c463acfc967377a144940b5b5f179012bd21d316e79e2ce9dcd8b003a40' 
  AND token = 'K36e/iawMFd8jo56hZfGrk4huy0xMTlzdQaIOjCjejk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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