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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb53900fe2a206620fa81f19900c3ecd6dbe6ed1e2104b950b887fd0a516440c' 
  AND token = 'MvLX6Nu9UCT7nHbOF1OugCGuexQtJNljIjHhRi/ks/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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