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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ec592df7f6f05a5b47236252cddb1055d8f850c0f52842dcfae3d4c6407f55' 
  AND token = 'cGxXockesUa/gE1DL7ANkLZlGJcm03Si6Fc3iS+mMDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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