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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a24b3b49b6b9b2a8cb030d8fb1738e40afbe969ccbb1689a9af2b75e7ec5d9' 
  AND token = 'eL9L3DodFoaF9P4BOholtbTdc9U2F884D//Ba5lTusI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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