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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4846c4c80952475542eaee49a18a24d23911af430cdcfdaa03e69c3c4b7d35d' 
  AND token = 'rMBB1ziFavQg3fzs+D3wUsphCNDUmBP0amHxxK4pzcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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