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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bab7dd97f7f2aa2fe7268cb33183c17dc898e34f3a0ee63a1af024d747dcc5' 
  AND token = '73R80/f0aQ7gkFGvXr+qSPlry7MUhBPkgmayj8qZkCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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