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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0651d59c0c2569ab2f3feb72b9cb0fa7c22a50b13bab0658b956cbdd650b184e' 
  AND token = 'BkJVqXlYQHuKw8JnoDQNRrllUdvtxXxvWbqep7mg6S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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