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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0691574765b1e10c91a2fd07582c0f6a089b3513d1d88f7fc92cf0532c2b60fd' 
  AND token = 'Eha4638rpzqs4Ym9jASiJygx/nXfg5omlkLeVWGcgr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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