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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba7429dd065e6d123f17d1bdb08a6c4327f689c5ebbc3cbc22f22c294801435' 
  AND token = 'pgaVg6CoP6BetPcGk6MtAhk/WSlhxOTTMkLLxxDwz8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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