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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b704b754fd75536ccf23d19041833c3b800d4a21e6e3eb954b7226c5dcf73d9d' 
  AND token = 'TEPJYEXDEZ9lmauGyz8CSJbuB56bmfxbUz0v0S0kb8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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